science journal says the nasa curiosity rover made the discovery in a large crater. for decades though scientists have known there was water on mars but now they know it could have been fresh water to sustain life. the lake existed more than 3.5 billion years ago. >>> speaking of space a youngster from colorado is now on a mission to save nasa. >> 6-year-old conner johnson started a petition on the white house website after he found out about funding caughts to the -- cuts to the space program. if too many are made his dream of becoming an astronaut could be crushed. >> well, i would be very sad. nasa's mostly the only space station -- space company i've known for a very long time. >> the petition already has more than 8,000 signatures. 100,000 signatures are needed to get a response from the white house. >>> 4:56 right now. the search for six family members missing in northern nevada grows more desperate by the minute. the challenges facing rescuers and their families. >> and today, the world says good-bye to nelson mandela. and even through the rain south africans